HP Surestore Disk Array FC60 HP SureStore E Disk Array 12H User's and Service - Page 197

Removal and Replacement Backplane Assembly-HP-qualified personnel only SCSI Bus Reset Switches-HP-qualified personnel only CAUTION! After replacing the backplane assembly, make sure that the SCSI bus reset switches are set as shown in Figure 33. Altering the default factory settings on the SCSI bus reset switches may cause operating system conflicts for the host computer(s). The SCSI bus reset switches (see Figure 33) are located on the top-left corner of the backplane assembly. To locate the switch, remove the rear cover to expose the switch. Figure 33 shows the switch segments on the SCSI bus reset switch and Table 15 shows the switch functions. The SCSI bus reset switches are preset at the factory for proper operation. A SCSI bus reset is a very high priority interrupt. The SCSI bus reset option is used when the host controller or software requires a SCSI bus reset to be sent as notification of the removal of a controller or of a power shutdown. The default setting for the SCSI bus reset switch is shown in Figure 33. There are two switches for each bus; one switch for power detect and the other is for controller detect. When enabled, the SCSI bus is reset when the following conditions occurs: Power detect conditions: • The power switch is cycled. • When power is first applied (power on). • When all power is removed (power off). Controller detect conditions: • A controller module is removed. • A controller module is inserted. The following actions will not cause a power or controller detect (reset) condition: • Removing, replacing, or adding a single power module if there are two additional functioning power modules in the enclosure. A single power module is not sufficient to operate a fully loaded disk array. • Removing a fan module. NOTE! Removing a single fan module will power off the disk array. 197 Removal